Schrauder A, Schweiger B, Buchholz U, Haas W, Sage. Laboratory Exposure to Influenza A H2N2, Germany, 2004–2005. Emerg Infect Dis. 2006 Dec
From November 2004 to February 2005, a company contracted by the College of American Pathologists (CAP) sent influenza quality assurance samples containing live influenza A H2N2 viruses (A/Japan/305/57) to 3,748 international laboratories. Of these, 3,686 (98%) were located in Canada or the United States. In Germany, 6 laboratories received at least 1 set of 3 samples, 2 for virus antigen detection and 1 for virus culture; all contained live virus and were formatted identically. No information on infectivity or virulence of the samples was available. Because of the absence of human-to-human influenza A H2N2 virus transmission since 1968, this situation provided the rare opportunity to investigate whether infections with this strain had occurred in any of the laboratories.
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